| 摘要 |
An improved circular sliderule for use in many applications wherein it is desired to provide a sliderule having superimposed disc elements which may be freely rotated without disturbing the previous setting of the adjacent discs. The novel improved calculator comprises providing a separating spacer element to be positioned between each disc of the calculator and with each spacer element having formed thereon means for retaining the rotation of the spacer element whenever superimposed discs are rotated. The retaining means may comprise a series of protruding arms, one extending outward from each of the separating spacer elements, joined at their outer ends and locked to the base plate of the calculator which is not rotatable. Alternately the retaining means may comprise the spacer element having formed on an internal hole at least one protuberance which is designed for mating engagement with an engaging means in the form of an elongated slot formed in the central hub which is locked to the baseplate.
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